According to TDK, the drive is 20% smaller than 2.5.-inch notebook drives. It
also consumes less power and isn't prone to the same failure factors as traditional
drives. TDK's Japanese press release claims:

Along with TDK's "GBDriver RA5" NAND flash memory control LSI,
this semiconductor disc features four super capacitors (optional) for the power
supply interruption assist circuit and a 2.5-inch ATA interface. The GBDriver
RA5 supports "UltraDMA mode2" data transmission mode that boasts a
maximum data rate of 33.3 MB per second.